When you first get the Dragunov sniper rifle and have to snipe enemies headed for Chase, finish the task and then DO NOT jump the gap to meet up with her. Drop down the ledge before the gap and use the handholds to climb to an area under the sniping point with this Glyph.

After the first sniping scene, cross the gap and run down the path. On your right you will find an alcove with some bamboo. Chop through this and climb up to a platform with more bamboo. Cut this down to find the Rubbing spot.

As you make your way down the tire-rutted road with Chase, you’ll fight your first enemy with a Moss 12 Shotgun. Search the right side of the path here for a wall with handholds. The Sextant is at the top.